void DisposeToBackground(wxDC& dc);
void DisposeToBackground(wxDC& dc, const wxPoint &pos, const wxSize &sz);
void DisposeToBackground(wxDC& dc);
void DisposeToBackground(wxDC& dc, const wxPoint &pos, const wxSize &sz);
void IncrementalUpdateBackingStore();
bool RebuildBackingStoreUpToFrame(size_t);
void DrawFrame(wxDC &dc, size_t);
void IncrementalUpdateBackingStore();
bool RebuildBackingStoreUpToFrame(size_t);
void DrawFrame(wxDC &dc, size_t);